Power-hammer.



N0. 808,256. PATENTED DEC. 26,1905. F. P. POLASKI.

POWER HAMMER.

APPLICATION FILED MARJls, 1905.

w@ f f WW1/wow:

attenua? y v'Ururnn sTaTns PATENT oTTron.

POWER-HAMMER'.

Specification of Letters Patent.

Patented Dec. 26, 1905.

Application filed March 13, 1905. Serial llo. 249,799.

power-hammers, and has for its object to pro- Y vide an apparatus of this general character which will combine in its construction and operation a strong', durable, and light framework with great force, power, and ease of operation of the several working parts.

My invention consists, essentially, of a power-hammer comprising an open-slotted frame connecting' with an anvil-post carrying the anvil at one end and with vertical side beams at the opposite end, a rock-shaft ful- 1 crumed on said beams and provided at its front end with means for adjusting a hammer therein and at its rear end with a ball-and-socket joint connecting with a swiveled frame carrying an elliptical spring, a foot-lever, and means for connecting the same with the rock-shaft.

My invention further consists in the novel construction and general arrangement of parts hereinafter fully described, illustrated in the drawings, and particularly pointed out in the claim.

In the drawings forming part of this specification, wherein like numerals of reference designate corresponding parts, Figure l is a side elevation of a power-hammer embodying the essential features of my invention, and Fig. 2 a detail view of the ball-and-socket joint connecting with the rear end of the rockshaft.

Referring to the drawingsthe numeral 1 designates the base of the framework, which is capable of being readily secured to a floor or other proper foundation and having the anvil-post 2, preferably formed integral therewith to provide a strong, rigid, and reliable base.

The vertical side beams 3 project upwardly from the rear part of said base 1, to which they are suitably attached, one on each side' thereof or formed integral therewith, if deemed preferable, said beams and the side bars A constituting an open frame to secure lightness and strength, and the front ends of said bars being suitably bolted to the anvilpost 2, carrying the anvil 2', while near their rear ends said bars are also suitably bolted to the vert-ical side beams 3. The extreme rear ends of the side bars A incline inwardly toward and touch each other and are held securely in place by asuitable cross-bolt 5, as fully shown in Fig. 1.

The rock-shaft 6 has its bearings or fulcrum in the tops of the side beams 3, and the front end ofsaid rock-shaft is provided with an elongated open slot 7 for the reception and adjustment therein of the handle 8 of the hammer 9. The handleof said-hammer is adjusted at the desired position in said slot 7 and securely held in such position by means of the clips 10 and screw-bolts and nutsll, while to the eXtreme rear end of said rock-shaft is pivoted the upper end of the ball-and-socket joint 12, the ball wherein is formed integral with a screwthreaded bolt 13 which projects downwardly and engages with a corresponding opening in the ltop bar of the vopen frame 15, said screwthreaded bolt 3, being provided with asquared shank 14, whereby said bolt may be turned and adjusted in the desired position in the head of the open frame 15 to regulate and control the area of motion of the hammer 9.

The open frame 15 is composed of the head or top bar connected wit h the two downwardlyprojecting side rods, the lower ends of which are screw-threaded and adapted to engage with corresponding openings in the projecting ears or lugs of the rectangular clip 16, which incloses the central portion of the lower member of the elliptical spring 17 and holds it securely in place therein, the upper member of said spring resting against the lower rear ends of the side bars 4:, to which it may be securely connected if deemed desirable.

The foot-lever'lS is preferably bifurcated at its rear end and suitably journaled between the vertical side beams 3, while its front end is provided with a loop 19, encircling the anvil-post 2, thus forming a foot-treadle which may be easily operated on all sides of said anvil-post, as fully shown in Fig. 1 of the drawings. A bifurcated rod 2O is pivoted to the foot-lever 18 at its lower end and to the rockshaft 6 at its upper end in such manner that by the depression of said `foot-lever 18, by means of the foot-treadle 19, the rock-shaft is actuated, compressing the elliptical spring 17 and bringing the hammer 9 down upon the anvil or upon the article to be operated upon,

IOO

IIO

the elliptical spring 17 serving to immediately restore the hammer and its operative parts to normal position.

Having thus described my invention, what I Claim as new, and desire to secure by Letters Patent, isn

A power-hammer, comprising a framework having an anvil thereon, a hammer to coperate therewith and Carried by afulerumed beam, aiiexible joint carried by one end of said beam, a screw-threaded shank projecting from said joint,a U-shaped member adjustably connected to said shank, and an elliptical spring resting under or secured to a stationary part of the framework and passing between the sides of I5 said U-shaped member, the lower portion of said spring being connected to the sides of said U-shaped member and adapted to restore the hammer to its normal position.

In testimony whereoiI I have hereto atixed 2O my signature in the presence of two witnesses.

FRANK I. POLASKI.

Witnesses:

K. C. Cox, THos. H. BROWN. 

